The pair of species having identical shapes for molecules of both species is
(a) CF4,SF4
(b) XeF2,CO2
(c) BF3,PCl3
(d) PF5,IF5 .
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Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h.
The value of ‘g’ at the equator of the earth is less than that at poles. Therefore, the packet falls slowly at equator in comparison to the poles. Thus, the...
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Water molecules have hydrogen and oxygen in the ratio of 1: 8 by mass. Find the ratio of number of atoms of elements in water molecules.
Ratio of number of moles 1 /1 ∶ 8/ 16 Number of moles = Mass / Atomic mass Number of moles of hydrogen = 1/ 1 = 1 Number of moles of oxygen...
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Explain why objects moving in fluids must have special shapes
When a body moves through a fluid, it experiences an opposing force which tries to oppose its motion through the fluid. This opposing force is known as the drag force....
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Fill in the blanks in the following (i) Artificial magnets are made in different shapes such as __________, __________ and
(i) Artificial magnets are made in different shapes such as bar-magnet, cylindrical magnet and horse-shoe magnet. (ii) The Materials which are attracted towards a magnet are called magnetic material. (iii) Paper is...
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Two wires A and B, having identical geometrical construction, are stretched from their natural length by small but equal amount.
(d) The information is insufficient to find the relation between t1 and t2 EXPLANATION: Since Yₐ > Yᵦ, for equal strain tension Tₐ > Tᵦ. Since ρₐ > ρᵦ, µₐ > µᵦ....
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Out of the following pair, which one does NOT have identical dimensions is (1) angular momentum and Planck’s constant
(3) Using dimension
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A spinning wheel is brought in contact with an identical wheel spinning at identical speed.
The correct answer is: (a), (c) (a), kinetic (c) mechanical
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How many three digit numbers can having only two consecutive digits identical is
(b) When 0 is the repeated digit like 100, 200, ...., 9 in number When 0 occurs only once like 110, 220, ....., 9 in number When 0 does not occur like 112, 211, .....,...
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Write the state of hybridisation of carbon in the following compounds and shapes of each of the molecules.
(a) In H2C=O, C is sp2 hybridised, hence formaldehyde is trigonal planar. (b) In CH3F, C is sp3 hyybridised, hence methyl fomaldehyde is tetrahedral. (c) In HC≡N, C is sp hybridised, hence...
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A square is divided into 9 identical smaller squares. Six identical balls are to be placed in these smaller
(d) Total number of ways in which 9 balls occupy any of the 6 squares = 9C6 = 84 Number of ways in which one row is not filled = 3 ∴...
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